linux-kernel - 回复: [PATCH v3 10/13] media: cadence: csi2rx: Enable multi-stream support

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Date: Mon, 21 Apr 2025 07:02:47 +0000
From: Changhuang Liang <changhuang.liang@...rfivetech.com>
To: Rishikesh Donadkar <r-donadkar@...com>, "jai.luthra@...ux.dev"
	<jai.luthra@...ux.dev>, "mripard@...nel.org" <mripard@...nel.org>
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Subject:
 回复: [PATCH v3 10/13] media: cadence: csi2rx: Enable multi-stream support

> From: Jai Luthra <j-luthra@...com>
> 
> Cadence CSI-2 bridge IP supports capturing multiple virtual "streams"
> of data over the same physical interface using MIPI Virtual Channels.
> 
> The V4L2 subdev APIs should reflect this capability and allow per-stream
> routing and controls.
> 
> While the hardware IP supports usecases where streams coming in the sink
> pad can be broadcasted to multiple source pads, the driver will need
> significant re-architecture to make that possible. The two users of this IP in
> mainline linux are TI Shim and StarFive JH7110 CAMSS, and both have only
> integrated the first source pad i.e stream0 of this IP. So for now keep it simple
> and only allow 1-to-1 mapping of streams from sink to source, without any
> broadcasting.
> 
> With stream routing now supported in the driver, implement the
> enable_stream and disable_stream hooks in place of the stream-unaware
> s_stream hook.
> 
> This allows consumer devices like a DMA bridge or ISP, to enable particular
> streams on a source pad, which in turn can be used to enable only particular
> streams on the CSI-TX device connected on the sink pad.
> 
> Implement a fallback s_stream hook that internally calls enable_stream on
> each source pad, for consumer drivers that don't use multi-stream APIs to still
> work.
> 
> Signed-off-by: Jai Luthra <j-luthra@...com>
> Co-developed-by: Rishikesh Donadkar <r-donadkar@...com>
> Signed-off-by: Rishikesh Donadkar <r-donadkar@...com>

Reviewed-by: Changhuang Liang <changhuang.liang@...rfivetech.com>

Best Regards,
Changhuang